That's really weird, and other than the visuals, did all those dancers function as expected?
just to add on, chaser is meant to drain 2 attack on all newly recruited followers. i see it does that to followers with less than 2 attack. and brings their attack to 0. i do not see that working on support followers. chaser can drain gladiator for 2 dmg but gladiator passive will fill it back to full hp. unintended synergy. adaptive chaser drains 2 from new recruits but gains 4.